Troubleshoot issues with Gmail signatures
If you're having problems uploading an image to your signature, try these solutions:
  1. Clear your browser cache.
  2. Clear cookies for mail.google.com.
  3. Allow all cookies for Gmail.
  4. Change Google Drive sharing permissions for the image.
  5. Upload the image in a Chrome incognito window.
  6. Upload the image with a different browser.
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